The Vercetti Estate Spandrel is the triangular base of the Vercetti Estate Staircase, normally this area has a door beyond it in mansions such as the Vercetti Estate but it apparently doesn't include any visible storage and for years the spandrel was considered to be a normal one. However, a technical investigation revealed that there is an unused and hidden room behind the spandrel. The room has pitch black walls and a peculiar brown surface, the brown surface expands to a passage behind the wall adjacent to the spandrel. This passage is also unused and unloaded. A rational explanation would be that Rockstar left the passage and spandrel in development and the complete version didn't make it to the final release. The spandrel could be a potential resting place and it is plausible that Vercetti gang could've buried Diaz beyond the spandrel to avoid suspicion. However, it is unlikely since it is still unloaded.